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Senior Debt - Additional Information (Detail) - USD ($) |  | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Sep. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2017
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Prepayment of outstanding debt |  | $ 29,200,000 |  |  |  |
Scheduled payments of debt |  | 1,600,000 |  |  |  |
Repayments of debt |  | 30,756,000 | $ 7,656,000 |  |  |
Final scheduled principal payment due in September 2020 |  | $ 83,100,000 |  |  |  |
Weighted average stated interest rate on outstanding borrowings |  | 4.89% |  |  |  | 4.08%
Interest rate swap, fair value, asset |  | $ 700,000 |  |  |  | $ 300,000
Credit facility, date of amendment | Oct. 31, 2017 |  |  |  |  |
Maximum consolidated leverage ratio | 375.00% |  |  |  |  |
ING Bank N.V. ("Aarding") [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Total borrowing capacity |  | 15,200,000 |  |  |  |
ING Bank N.V. ("Aarding") [Member] | Bank Overdrafts [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities |  | 0 |  |  |  | 2,800,000
Scenario Forecast [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Maximum consolidated leverage ratio |  |  |  | 325.00% | 350.00% |
Credit Agreement [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Unused credit availability under credit facility |  | 58,200,000 |  |  |  | 54,600,000
Letters of Credit [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities |  | 21,800,000 |  |  |  | 24,400,000
Bank Guarantee Facility [Member] | ING Bank N.V. ("Aarding") [Member] |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities |  | $ 8,700,000 |  |  |  | $ 3,900,000

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- Definition Maximum consolidated leverage ratio. + References No definition available. + Details
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- Definition Amount of the required periodic payments including both interest and principal payments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt. + References No definition available. + Details
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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition Fair value as of the balance sheet date of all interest rate derivative assets designated as cash flow hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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